Get Your Impala Shifting Smoothly Again
If you’re dealing with the frustration of a Chevrolet Impala that shifts harshly, gets stuck in gear, or has a persistent check engine light, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM vehicles, especially the 2006-2011 Impala, come into the shop with these exact symptoms. More often than not, the culprit is a failing Transmission Control Module (TCM). This isn’t just an annoyance; it affects your car’s performance, fuel economy, and safety. A faulty TCM can leave you stranded in ‘limp mode’ at the worst possible time.
This T42 Transmission Control Module is the reliable, straightforward solution you need. It’s not just a replacement part; it’s a complete fix that arrives at your door pre-programmed to your Impala’s specific Vehicle Identification Number (VIN). This means you can skip the expensive trip to the dealership for programming. It’s designed to restore the precise, factory-spec communication between your engine and transmission, ensuring every gear change is smooth and responsive, just like it was meant to be.
From the Diagnostic Bay
I remember a 2009 Impala that came in with a classic P0700 code (Transmission Control System Malfunction) and erratic shifting. The owner had already replaced a shift solenoid based on a sub-code, but the problem persisted. After a quick check of the wiring harness, we identified the TCM as the source of the intermittent electrical faults. Instead of a costly dealer part and programming fee, we installed one of our VIN-programmed modules. The entire job took less than 30 minutes, the codes were cleared, and the car drove off shifting perfectly. It’s a common story, and this part is the hero every time.
Is Your Impala Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention:
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ Vehicle is stuck in one gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, especially P0700, P0750, or other solenoid-related codes.
- ✔ Complete failure to upshift or downshift.
- ✔ A noticeable drop in fuel efficiency.
- ✔ The transmission seems to be slipping out of gear.
A Straightforward Guide to Installation
One of the best features of this part is its simple, plug-and-play installation. For the 2006-2011 Impala Transmission Control Module, the process is quick and doesn’t require specialized tools. You can do this right in your driveway.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the TCM: On your Impala, the TCM is typically found inside or underneath the air cleaner housing in the engine bay. You may need to remove the air filter box to access it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place and securely reconnect the electrical harnesses. You’ll hear a click when they are properly seated.
- Final Steps: Reinstall the air cleaner housing and reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. If you have a basic scan tool, use it to clear any stored DTCs.
Verified Vehicle Compatibility
This T42 TCM is a direct fit for a wide range of General Motors vehicles. While this page is focused on the 2006-2011 Impala Transmission Control Module, it is also compatible with the following models. Please verify your specific model and location notes.
- Chevrolet Impala: 2006-2011 (Transmission; lower air cleaner housing)
- Chevrolet Monte Carlo: 2006-2007 (Transmission; lower air cleaner housing)
- Buick Allure / LaCrosse: 2006-2009 (Transmission; lower air cleaner housing)
- Pontiac Grand Prix: 2006-2008 (Transmission; lower air cleaner housing)
- Chevrolet Cobalt & HHR, Pontiac G5 & G6, Saturn Ion: (Typically located on or near the LH strut tower)
- Chevrolet Silverado, Tahoe, Suburban; GMC Sierra, Yukon: (Typically located next to the battery)
- …and many other GM models listed in the full fitment data. This part is interchangeable with service numbers 24252114, 24234503, 24230461, and more.
Do I need to get this module programmed by a dealer?
Do I need to get this module programmed by a dealer?
No. This is the biggest benefit of our service. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for plug-and-play installation, saving you hundreds in dealership programming fees.
What is a ‘core charge’? Do I need to send my old part back?
There is no core charge for this part. You can keep your old module without any extra fees or hassle, making the replacement process even simpler.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like internal failure), you should ensure other components like wiring and solenoids are in good condition. In many cases I’ve diagnosed, a new TCM is the correct fix.
What is the warranty on this part?
This transmission control module comes with a one-year warranty, giving you peace of mind and confidence in your repair.